Operating mechanism for power-wrenches.



R. B. REDMAN. OPERATING MECHANISM FOR POWER WRENCHES.

APPLICATION FILED SEPT- I4. 1914.

Patented June 27*, 1916.

RICHARD REDMAN, 0F MILIBANK, SOU TH DAKOTA.

OPERATING MEC I-IANISM FOR BOlliTER-WRENCHES.

Specification of Letters Patent.

Patented June27, 1916.

Application filed September 151,1914, Serial No. 861,662.

To all whom it may concern:

Be it known that I, B o -lane R. REDMAN, a citizen of the United States, residing at Milbank, in the county of Grant, State'of South Dakota, have invented certain new and usef l Improvements in Operating l\lechanis r n for PowenWrenches; and I do hereby declare the following'to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which appertains to make and use the same. I i

This invention relates to a power wrench but I do not want to be limited to the use of the machine fora wrench for as will later appear it may be used in connection with other tools such as drills or the like.

An object of the invention is to provide a machine whereby nuts, pipes and the like may be readily screwed or unscrewed and during which action there will be no likelihood of the said nuts or pipes breaking.

A further object of the invention is to provide means for intermittently turning the nut clamping means.

A still further object of the invention is to so construct the machine that it may be used in connection with a drill which is so connected to the machine that it may be readily carried from "one place to the other.

A still further object of the invention is to provide acompact and simple device which may be transported from place to place as the use may require.

Vith these and other objects in View, snc h as will appear as the description progresses, my invention comprises the combination and arrangement of parts as herein set forth and falling within the scope of the appended claims. i v

Referring to the drawing: Figure 1 is a side elevation of my machine. Fig. 2 is a section on line 2 2 of Fig.1. Fig. 3 is a longitudinal sectional View of a portion of the" machine showmg the friction clutch. Fig. 1 is a section on line 414 of Fig 1. Fig; 5 is a section on line 55-5 of Fig. 1. Fig. .6 is a fragmental detail.

Referring to the drawing wherein like parts are" 'ndicated by like characters throughout the several views, my device comprises a base 1 sn pported on rollers 2 and having secured to the np oer face thereof upwardly extending standards ,3 wl ich ha vebearings" 4: and 5' on their upperends.

heyolu ly ment l ee-"L es t i hollow shaft 6 on one end of which is integrally formed a drum 7 having on one face a pair of spaced gears-8' and 9 and in the other face a frusto-conical chamber 10. Extending partially through .the hollow shaft .6 and revolubly mounted therein is a shaft 11 which extends outwardly-therefrom and is supported by the bearing 5 and has attached thereto a flexible shaft 12 on the end of which last mentioned shaft may be attached a clamp to be used as a wrench or any other desirable tool which must necessarily be rotated or oscillated in its operation. Se

cured to this shaft 11 within the member 10 of -the drum 7 is apair of outwardly extending arms 13 which have pivotally secured to their ends shoes 14 which are adapted to move about their pivots to frictionally engage the inner face of the said member 10 and thus clutch the shaft 11 to thehollow shaft 6, to which latter shaft motion is imparted as will later appear. In order that these shoe members 1 1 may be controlled to engage the inner face ofthe of its ends to the arm16 so that the shifting "of the said lever will move the collar 15 inwardly or outwardly from the said drum 7.

order that this lever 17 may be controlled in its movement from the operating end of the flexible shaft 12, I have provided on the said' lever a spring p1-essedpawl18 which engages notches 19 in the standards 3 and to which is connected a flexible member '20, the said flexible member running parallel to and guided by the flexible shaft 12 to a point 'adjacent the tool carrying. end thereof yvhere it is connected to an operating handle 21'. When this flexible member 20 is pulled so as to oscillate the lever 17 about its pivot, the shoes 14: are extended so as to engage the "ides of the chamber 10within the drum 7 andthe pawl 18 engages the notches 19 and maintains the shoes in such relation. However; when the pawl is disengaged from the ease .19 time? a t fle ibl mem 20 the rotation of the drum 7 will throw the shoes out of contact with the face of the drum and consequently the shaft will thereafter rotate independent of the shaft 11 which will cease rotation.

In order that intermittent rotary motion may be imparted to the shaft 6 and consequently the drum 7, I have provided the following mechanism: Secured to the base 1 in spaced relation tothe vertical standards 3 is an additional standard 22 having a bearing23 on the upper end thereof in which bearing is revolubly mounted a shaft 24, the said shaft extending into and revolubly mounted in the hollow shaft 6. On one end of this shaft is a graduated pulley 25 to which motion is imparted by a belt 26, which belt passes over a second graduated pulley 27 on a motor 28. Secured to this shaft 24 is a cam 29 which cooperates with a lever 30, the latter being secured to a shaft 31 revolubly supported in bearings 32 on the standards 3 and 22 near the lower ends thereof. Secured to the shaft 31 and Xtending at right angles thereto is an arm 34 to which is secured a. link 35, which toggle is at its upper end pivotally secured to a lever 36, Which lever is oscillably mounted on the hollow shaft 6 adjacent the gear wheels 8 and 9. As the shaft 24 is rotated the cam 29 causes the lever 30 to oscillate about its pivot and consequently through the connection between this lever and the lever 36 causes the latter to oscillate about its pivot. Pivotally secured to this lever 36 is a double pawl 37 which extends to the engaging points 38 and 39, the former adapted to engage the gear 8 and the latter the gear 9. A coil spring 40 normally tends to press these points in engagement with the gears. When it is desired to rotate the shaft 11 in one direction, the point 39 is engaged with the gear 9 and the subsequent oscillation of the lever 36 will impart rotary motion to the said shaft 11 through the drum 7. However, if it is desired to impart rotary motion to the said shaft in the opposite direction the pawl 37 is swung about its pivot to extend in a downward direction from the lever 36 and so that the point 38 engages the gear 8 at which time the subsequent oscillation of the lever 36 will impart rotary motion to the drum 7 and through this drum to the shaft 11.

In order that the pawl 37 may be returned to its initial position after having once actuated the gear with which it is engaged, I have provided a coil spring 41 which is connected to the lower end of the link 35 at one of its ends and to the base 1 at its other end. Thus it may be seen that as rotary motion is imparted to the shaft 24 the shaft 11 will be rotated through the mechanism previously described and from this shaft rotary motion will be imparted to the flexible shaft 12 and the tool on the end thereof will consequently be rotated intermittently. The bearing 5 on the upper end of the standards 3 comprises a casing 42 into which the shaft 11 extends and which has an enlar ed chamber 43 in one end thereof. Gonnected to the end of the shaft 11 is a link 44 which rotates in the said chamber 43 and which is at its other end connected to the flexible shaft 12 so that upon the rotation of the shaft 11 rotary motion will be imparted to the said shaft. 12 in the manner previously described.

By providing the particular form of drum 7 and shoes 14 which form a friction clutch and by imparting intern'iittent rotary motion to the said drum 7 a tap or the like may be readily unscrewed and in case the same has become stuck the frictional engagement of the shoes 14 with the inner face of the chamber 10 of the drum 7 will allow the said drum to slip with relation to the shaft 11 so that all possibility of the tap becoming broken by the continuous rotation of the shaft 11 will be obviated. It is sometimes desirable, however, to impart continuous rotary motion to the shaft 11 in order that a tool such as a drill may be operated and for this'purpose I have provided on the end of the shaft 6 a clutch member 45 which cooperates with sliding clutch member 46 on the shaft 24. A controlling lever 47 is pivotally secured to one of the standards 3 and operatively connected to the sliding clutch member 46 by means of a link 48 so that the said clutch member may be, at will, shifted into engagement with the clutch member 45. It is of course desirable at this time to prevent the engagement of the pawl 37 with -the gear wheels 8 and 9 and also prevent the oscillation of the lever 30 and for this purpose, I have provided a ratchet wheel 49 secured to the said lever 30 concentric with its pivotal point and pivotally secured adjacent this ratchet wheel 49 a pawl 50 which engages the teeth of the said ratchet and maintains the said lever 30 out of engagement with or out of the path of the cam 29 and thus prevents the actuation of the pawl 37. In order that this pawl 50 may be actuated to throw the lever 30 out of engagement with the cam 29 simultane ously with the engaging of the, clutch memhers 45 and 46, I have connected the said pawl 50 with the lever 47 by an actuating link 51. Thus it may be seen that as the clutch members 45 and 46 are thrown into engagement with each other, the pawl 37 will be rendered inoperative and consequently will not actuate the gears 8 and 9.

From the foregoingdescription it may be seen that I have provided a machine for intermittently'rotating a wrench so that a tap or the like may be readily unscrewed and I have so constructed the machine that should the tap become stuck the motion tending to unscrew the tap will not be continuous, but will be imparted to the tap intermittently and in such manner that when the friction of the tap. or the member to which it is secured is greater than the friction between the members of the friction clutch on the driving shaft, the said friction clutch will slip so as to allow the tap to remain in its position and consequently obviate the breaking of the said tap.

I have further so constructed the machine that the means for imparting intermittent rotary motion thereto may be thrown into inoperative position and means for imparting continuous rotary movement thereto thrown into operative position. And I have so constructed and connected these means that as one is thrown out the other is simultaneously thrown in. I

I have further so constructed the means for imparting intermittent rotary motion to the operating shaft that the same may be imparted so as to rotate the shaft in either direction at the will of the operator.

WVhile I have illustrated and described a particular embodiment of my invention, it has merely been for the sake of convenie'nce and I therefore do not wish to be limited to that particular embodiment as it is obvious that numerous changes in the details of construction thereof may be made without departing from the spirit of the invention as defined by the claims.

Vhat is claimed is 1. In a machine of the class described, a base, a plurality of bearings supported thereon, a shaft revolubly mounted in one of said bearings and having a drum on one end thereof, a plurality of gears integrally formed on said drum, a pawl pivotally supported on the said shaft and adapted to selectively engage the aforementioned gears, a clutch member on the end of said shaft, a second shaft extending into the first mentioned shaft and revoluble therein, a slidable clutch member on said second mentioned shaft, and means to render said pawl inoperative and simultaneously engage said clutch members.

2. In a machine of the class described, the combination with a shaft, of meansfor imparting intermittent rotary motion thereto in either direction, means for imparting continuous movement thereto in one direction and means for rendering the first mentioned means inoperative and simultaneously rendering the last mentioned means operative. 8. In a machine of the class described, the combination with a shaft, of a second shaft passing therethrough and rotatable therein, a pair of gears on the first mentioned shaft, a cam on the last mentioned shaft, a shaft in spaced relation to the first mentioned shaft, a two-pointed pawl operatively connected to the last mentioned shaft and adapted to engage in said gears, an upwardly extending lever on the last mentioned shaft engaging said cam, a clutch for securing the first and second mentioned shafts together and means for simultaneously rendering the clutch operative and throwing the lever out of the path of movement of the cam.

In testimony, whereof I afiiX my signature, in the presence of two witnesses. RICHARD R. REDMAN.

Witnesses:

' MABEL SALMONsON,

J. W. PAY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington. D. C. 

